My only concern about making places cell unfriendly is what about people who are on call? I would assume that doctors, healthcare professionals, and others who are "on call" do so with cell phones today. I guess this just means that you couldn't go to a movie or a play if you were on call. Suddenly I feel very sorry for single practicioners (like my doctor), who are basically on call the entire week.
You know, people survived without the INSTANT RESPONSE of cell phones for decades. They seem to have functioned quite well.
We are really far too trapped by our addiction to instant satisfaction.
There is *nothing* so urgent that you can't wait two hours or so. If there *is* potentially something you are waiting for (a wife about to go into labor, for example), maybe you should just not be going to a movie in the first place.